I have a table with a number of columns reserved for future use. Rather than returning all columns, e.g. "SELECT * FROM table", I am considering creating a view containing only the columns currently in use for read-only requests. Questions: ...
In the following section, you learn how to create, update and delete view objects in your MySQL database.Create a SQL View To create a new view object, you use the CREATE VIEW statement followed by the desired name of the object and the SELECT statement used for abstraction. Here, you ...
A view in MySQL is a virtual table that is based on the result set of a SELECT query. It does not store any data of its own but instead retrieves data from the underlying tables whenever it is queried. Views can be used to simplify complex queries, provide a layer of abstraction over...
What is the use of force view in SQL?Database languages:The database language is used to manage the data in the database. The data is stored in a tabular form so managing the data is easier. The language having keywords to manage the data. The select keyword is used for extracting ...
Description:if one creates a view (e.g. ab) based on a single underlying table that has a delimited name (e.g. `a``b`), the result of a SELECT from the view is this error: ERROR 1064 (42000): You have an error in your SQL syntax; ... But the view was accepted at CREATE ...
Description:I have an SQL statement. When in and = are combined with a subquery, the result sets returned by them are inconsistent. 1、SQL SELECT al.object_id3 AS product_id, al.object_id1 AS domain_id, DATE(al.created_dt) AS view_date, COUNT(al.object_id3) AS count FROM activitylo...
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A view could be useful in cases like this, since a view is essentially a table derived from the results of a query. To create a view, most RDBMSs use the following syntax: Example CREATE VIEW syntax CREATE VIEWview_nameASSELECT statement; ...
In this article, we will learn how to use the IF EXISTS clause in MySQL while using DROP DATABASE, DROP TABLE, and DROP VIEW commands, along with syntax and examples. 1. Drop Database IF EXISTS Command Syntax: DROP DATABASE [IF EXISTS] name_of_database; ...
http://dev.mysql.com/doc/refman/5.0/en/create-view.html CREATE TABLE t (qty INT, price INT); INSERT INTO t VALUES(3, 50); CREATE VIEW v AS SELECT qty, price, qty*price AS value FROM t; SELECT * FROM v; But it shows me ...